Improvement in lifting-jacks



J. BUEL.

' Lifting-Jack.

Patented-sept. 10.1878.'

UNITED STATES PATENT OEEICE.

JAMES BUEL, OF WOBUBN, MASSACHUSETTS.

IMPROVEMENT IN LlFTlNG-JACKS.

Specieation forming part of Letters Patent No. 207,850, dated September10, 1878; application led v August 26, 1878.

To all 'whom it may concern:

Be it known that I, JAMES BUEL, of Woburn, State of Massachusetts, haveinvented an Improvement in Lifting-Jacks, of which the following is aspecification:

This invention relates to that class of mechanical appliances whereinare combined in one machine a levered lifting-jack and a jackscrew; andthe invention consists in the peculiar construction and combination ofthe constituent parts of the machine, as will be hereinafter describedand claimed.

In the accompanying drawings, Figure l is a side elevation. Fig. 2 is afront elevation. Fig. 3 is a detached vertical section taken in thedirection of the handle, which latter and the lower portion of thestandard are broken away. Fig. 4 is a detached sidc elevation similar toFig. 1, but omitting the standard, and with the hither cam on thescrew-nut broken away to show the inside parts. Fig. 5 is a sectionthrough the pivot-bolt of the handle and on line Y Z, Fig. 1.

In these drawings, A is the base, which is preferably formed of iron,and B is the tubular standard secured therein, and on which is the malescrew-thread a. C is anut threaded correspondingly and to fit the malethread a. On opposite sides of this nut are formed the perforated ears cc, for reception of the pivotbolt h, on which the lever works; also thecams b b, within which the pins ff move.

D is a metallic socket, in which the lever or handle E is secured. Thissocket is bifurcated, and its members t' z' receive the pivotbolt h, andterminate in segmentary gears d d.

G is a rod sliding freely in standard B. H is a head, which may beeither rigidly secured to rod G or arranged to revolve thereon, asdesired.

F F are two connectingflrods, which at their upper ends are pivoted uponbolt g, which passes through head H. On the lower ends of these rods areformed the segmentary gears e e, which mesh into gears d d formed uponthe forks'of socket D. The pins f f formed upon these rods and movingwithin cams b b serve to retain the respective gears incontact.

In operation, the screw-nut C is turned up to such point on standard Bas will bring head H sufciently near the object to be raised, when, bydepressing handle E, such object will be raised to the extent of thescope of movement of head H, through the action of the gears on suchlever and the connectingrods F.

I claim as my invention- In a lifting-jack, the combination, with thehollow standard B, having screw a, of the nut C, having the cams b b,bifurcated socket or lever D, having gears d d, rods F F, having gears ee and pins f f, and the sliding rod G, moving within standard B, andprovided with a suitable head, H, all substantially as described andshown.

JAMES BUEL.

Witnesses T. W. PORTER, EUGENE HUMPHREY.

